drguitarum2005

Once I hit about 55 mph in my truck, I get a constant vibration that *feels* like its in the rear of my truck. I have the 63" chevy leaf swap (it was done by the previous owner, so i cant attest to its alignment, though it seems to be right on). I don't really have a way to measure this, but it seems like the axle might mount to the springs slightly on the "rear half" of the spring, to where it points the diff slightly down, when really it should be pointing straight forward (horizontal), if not up toward the other half of my d-shaft. From these pictures (hard to get a good angle), can anyone tell me if this looks like a severe angle that could be causing a vibration? if so, would those angled shims be a good idea to point the diff up? thanks guys! (some pics copied from my other rear axle leak thread)

Smiling_Jim

single carden shaft. The angle you have should work OK only for a double carden shaft.

You can get a DC shaft custom built for about $400-$500.

Or, if you have a single carden shaft, you will have to shim the pinion angle so that the flange is the same angle (parallel) to the trans case flange.

If already are running DC shaft then you may have worn out U joints.

drguitarum2005

im gonna pull a noob thing here and ask whats a DC shaft? if its two shafts, then i have that. it comes out of the tranny parallel to the frame and about halfway to the rear axle has a u-joint which points down to the rear axle and has the second u-joint that you see pictured

Smiling_Jim

They have 2 piece shafts.

By DC, I meant double carden. That means at the drive end there are two U joints in a coupler. That double u joint coupler is essentially a constant velocity joint.

I can't remember if the carrier bearing (between the front and rear shafts) has two u joints or one in the long bed trucks.

Maybe somebody else can comment.

davemacneil

See:

http://www.therangerstation.com/Maga...rden_joint.htm

BajaRunner

Off topic, but, it looks like you have a blown axle seal or two judging by the oil on the outside of the axle... :/

drguitarum2005

haha yeah thats a separate thread of mine that i mentioned earlier. its a mystery as to what it is really, but more details are over at https://www.yotatech.com/forums/f2/substance-all-over-rear-axle-102588/

Maj

Try shimming that puppy first. The shims are fairly cheap, easy to install and will probably at least lessen the vibration. Calculating the thickness/degree of shim you need can be a bit tricky. A magnetic angle finder helps alot.

Rhew Runner

Double check all bolts are tight.